ThermoWorks 222-553 User Manual

Operating Instructions

for Precision & Reference
Thermometers

INSTRUMENT OPERATION - Connect a
probe via the socket located on the top of the
instrument (where applicable). Screw the collar
of the plug, finger-tight to ensure a secure
connection (do not over tighten). The instrument
is switched on by pressing the ON/OFF button.
Apply the tip of the probe to the substance,
medium or surface to be measured. The instru­ment reading may take a few seconds to
stabilize, depending on the nature of the
measurement and sensitivity of the probe.
HOLD (where applicable) - Press the HOLD
button to freeze the display. Press again to
continue measuring.
MAX/MIN (where applicable) - Press the
MAX/MIN button to display the values. The
instrument retains the max/min values when
switched off. To reset, press the MAX/MIN button
for three seconds, 'rst' will be displayed.
AUTO OFF - The unit will switch off automati­cally after 10 minutes. To disable auto off press
the Hold button while switching on the instrument
(this is reset when the instrument is switched off).

CHANGE FROM FAHRENHEIT TO
CELSIUS - Press and hold the ‘On/Off’ button

for 5 seconds when powering the meter on and
the displayed temperature will change from °F
and °C.

TRIM - PRECISION & PRECISION PLUS
ONLY Press the MAX/MIN and ON/OFF

buttons at startup for five seconds to enter (Offset
is displayed). Press HOLD (up) or MAX/MIN
(down) to set the trim value (maximum of ±2.00
°C). Press the ON/OFF button to save the value
and exit Trim mode.
OPEN CIRCUIT/FAULTY PROBE - If the
probe has developed an 'Open Circuit' fault the
instrument will display 'Err'.
SENSORS - This instrument should only be used
with PT100 (platinum resistance probes, 0 °C =
100 Ω) BS EN 60751 fitted with suitable Binder
plug (where applicable). (The Precision and
Precision Plus accept both 3-wire and 4-wire
probes. It is recommended to use 4-wire 1/10
DIN probes when using the Precision Plus, for
best accuracy.)

BATTERY REPLACEMENT - The instrument
will display 'LO BAT' to warn that the batteries will
need changing soon. The instrument continues
to measure accurately but after further usage the
instrument will display 'flat bat' and shutdown.
Replace the batteries with three AAA batteries
located under the rear cover that is held in place
by a single screw.

GUARANTEE - This instrument carries a
two-year warranty against defects in either
components or workmanship. During this period,
products that prove to be defective will, at the
discretion of ThermoWorks, be either repaired or
replaced without charge. This warranty does not
apply to probes, where a six-month period is
offered. The product warranty does not cover
damage caused by fair wear and tear, abnormal
storage conditions, incorrect use, accidental
misuse, abuse, neglect, misapplication or
modification. Full details of liability are available
at www.thermoworks.com. In line with our policy
of continuous development, we reserve the right
to amend our product specification without prior
notice.

PRECISION / PRECISION PLUS

SPECIFICATIONS

Range:
Accuracy (Precision):
Resolution (Precision):
Sensor (Precision):
Accuracy (Precision Plus):
Resolution (Precision Plus):
Sensor (Precision Plus):
Probe:
Auto-Off:
Battery:
Buttons/Functions:
Certificate:

REFERENCE THERMOMETER

Range:
Accuracy:
Resolution:
Sensor:
Probe:
Battery:
Buttons/Functions:
Certificate:

-328 to 1562°F (-200 to 850°C)
±0.4°F (±0.2°C) meter only

0.1°F/°C
3 or 4-wire RTD Class A, 100Ω
±0.1°F (±0.05°C) meter only

0.01° Auto-Ranging to 0.1° above 199.9°
3 or 4-wire RTD 1/10 DIN, 100Ω
Interchangeable
After 10 min. to save battery life
3 x AAA, 2,000 hrs.
On/Off, HOLD, Min/Max, TRIM, °C/°F
NIST-Traceable Certificate included

SPECIFICATIONS

-328 to 400°F (-200 to 200°C)
±0.1°F (±0.05°C)

0.01°F/°C
4W RTD 1/10 DIN
Fixed
3 x AAA, 2,000 hrs.
On/Off with °C/°F
UKAS Accredited Certificate included

INSTRUMENT RECORD CARD

32°F 212°F

serial no. ________________________________

calibrated by ______________date ___________

This instrument has been checked or calibrated
against reference instrument(s) calibrated by a
UKAS Accredited Calibration Laboratory, which
are traceable, via International Agreement, to all
major National Standards, including NIST.

model order code

Precision 222-553

Precision Plus 222-550

Reference 222-055

Ref: 546-150 / 16.03.11

PT100 to BS EN 60751

ThermoWorks, Inc.

1762 W. 20 S. #100, Lindon, UT 84042

tel: [phone]

email: [e-mail]

www.thermoworks.com

PROBE WIRING DIAGRAM

PT100 BINDER PLUG WIRING

(Precision & Precision Plus)

Pin Function
1 +
2 +
3 - (3 Wire)
4 - (4 Wire)
5 Shield

3

2

1

Pin numbering as viewed from rear

4

5